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Re: Overflow in xlock
From: troy () AUSTIN IBM COM (Bollinger)
Date: Sun, 27 Apr 1997 09:30:53 -0500


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George Staikos wrote:

There appears to be an exploitable buffer overflow in xlock, the X based
screensaver/locker.  Xlock is installed suid root on machines with
shadowed passwords.  I have verified this on xlock versions on AIX 4.x

There's a temporary fix for the AIX v4 xlock available for anonymous ftp
from testcase.software.ibm.com:/aix/fromibm/xlock.overflow_fix.aix4.Z.

Checksums:

sum              01445    73 xlock.overflow_fix.aix4
sum -i           41749    73 xlock.overflow_fix.aix4
sum -o           14725    73 xlock.overflow_fix.aix4

MD5 (xlock.overflow_fix.aix4) = e5e679a73b5a28ef471751bfee67d00c


Official APARs are in progress and will be available shortly.

If there are any questions regarding this fix or any other AIX security
bug, please contact security-alert () austin ibm com   Sensitive
information can be encrypted using the AIX Security PGP key.  To
retrieve this key send email with a subject of "get key" to
security-alert () austin ibm com 

- --
+----------------  I do not speak for IBM!  ------------------+
|Troy Bollinger             |      email:  troy () austin ibm com|
|AIX Security Development   | Sometimes the old ways are best.|
+-------------------------------------------------------------+

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